Because smoothies pulp the fruit for juice, you get some goodness from it but also all the sugar. Most of the very best bits of the fruit is in the discarded flesh. Naked are a bit healthier than some other smoothies as they water theirs down (partly to save money, partly to claim they contain less sugar than their rivals).

Green one is the only good one I reckon. They've just legally had to remove antioxidant from the label I read too as basically it wasn't at all.